Regenerator of siemens-martin furnaces



Nov. 1, 1932. F. FIORELLI RBGENE RATOR OFSIEMENS-MARTIN FURNACES Filed Jan. 20 1930 2 Sheets-Sheet INVENTOR. 7 7 7 'L"'o1"liz M ffu ATTORNEYS.

Patented Nov. 1.21932 UNITED v STATES PATENT OFFICE! FEBDINANDO FIIOBELIII, O]? TEE NI, ITALY, ASSIGNOR 1'0 TERNI QOCIETA PER LINDUSTRIA E LELETTBICITA, OF 'IEBNI, ITALY BEGENERATOR OF SIEMENS-MARTIN FURNACES Application filed January 20,1930, Serial m3. 422,136, and in m January at, 1929.

In order to give the heat regenerating process its maximum efiiciency in openheart furnaces it is necessary that the weight of the checker work of the regenerator and its 5 heated surface should be in a certain relation to the weight of the gases, and that the speed of the latter in assing throu h the regenerating chambers s ould have a etermined value.

' As a result, any variation of operation ca- 1o pable of modifying the relations which are to subsist between the shape and dimensions of heat accumulators and the weight of the gases furnished in a time unit is detrimental to the regeneration of heat and, consequently, to the total efliciency of the furnace.

It? is accordingly to be noted that under this aspect the operative conditions of the Siemens-Martin furnace are wholly unfavorable. As a matter of-fact the steel melting go and refinin operations are eifected'in distinct perio 5 during which in order to obtain the most suitable combustion actions it is necessary to notably vary the gas and air quantities admitted in the time unit.

At the end of operation therefore the volumes of rising gases on the one hand, and the descending combustion roducts on the other hand are reduced to a raction of their respective initial values and the thermic so equilibrium for the regular regeneration of heat is materially altered, the weight of the checkerwork of the .regenerator remaining constant.

It may therefore be asserted, as a principle,

that the heat accumulators of the Siemens Martin furnaces either are excessive at the end of operation, or are insufiicient at the start.

The problem for eliminating the above de- 40 scribed drawback has now been solved by the inventor and the present invention consists in vertically dividing the mass of each heat accumulator into two parts, and in excluding one of them from operation by means of dampers during the less intense refining period of the furnace. The position. of the part to be periodically excluded depends upon the shape of the heat accumulator, and its weight is to be proportional to the decrease of gases obtained in said period.

With this arrangement it is not possible to obtain the desired gradual change, but the speeds and ratios of masses between the gaseous fluids and checkerwork may be ke t within practical limits'and'onlyslightly ifl'erent from the most favorable values. V v In the annexed diagrammatic drawings is shown a furnace of the Siemens-Martin type with heat accumulating chambers. In these drawings Fig. 1 is a longitudinal section along AB' of Fig. 2 of the regenerating chamber and Fig. 2 a horizontal section along line 0-1) of Fig. 1.

Fig. 1 of the drawings shows a cross sec-' m5 tion of Siemens-Martin furnace with air and gas ducts and cross section of a regenerating chamber. The division wall for subdividing the regenerator into aprimary or larger chamber is and a secondary or smaller cham- I'm ber Z is shown by reference letter m while 7 is the damper, which, when closed excludes air from the checkerwork of the smaller or secondary one of the two'chambers into which the regenerating chamber is permanently divided by said wall. The path of the gases will be according to arrows a a, whenthe damper is closed, but according to arrows a a and k' h. when the damper is open. The volume of the smaller chamber is approxiso 'mately half that of the larger one.

Fig. 2 shows the section along a horizontal plane CD of Fig. 1 of the regenerators, the divisional walls mentioned a'reindicated by mm, while 1' 0* better seen in Fig. 1, show the at dampers above the same. r

The galleries corresponding to the parts to be excluded in the refining period are separated. from the princi al galleries and com nected thereto throug dampersr 1".

Ate is shown a gas duct leadin from the melting furnace to the larger 0 amber is, whilea second gas duct 7 leads from a point of. junction 9 with saidfirst duct into the smaller chamber Z.- I 9 Having now'particularly described and as- 'certained the nature of my said invention and in what way the same is to be performed, I declare that what Iclaim is:

1. A heat regenerator for a regenerative W) meltin furnace, the volumetric size, and the heat a sorption capacity of which is controllable to accommodate the volume of the gaseous products of combustion assing through the melting furnace during oth its melting and refining periods of operation,

' furnace during its refining period of operation, and means for temporarily excluding the flow of gaseous products of combustion through the smaller chamber of the heat regenerator during the; refining period, the volumetric size of said chambers being approximately 2 to 1.

- 2. A heat regenerator for a regenerative melting furnace, the volumetric size, and the 'two chambers and heat absorption capacity of which, is controllable to accommodate the volume ofthe gaseous products of combustion passing through the melting furnaceduring both its melting and refining periods of operation, comprising chambers, the volumetric size of the second ary chamber corresponding to the loss in volume of the gaseous products passing from the melting furnace during its refining period of o' eration, a gas duct leading from the melting furnace to the primary chamber of the heat regenerator, a branch gas duct leading from the first named duct to the secondary chamber, and means in the branch duct for controllin the flow of gaseous products through t e secondary chamber durin the refining period of operation of the me ting furnace whereb both chambers are operative during the me ting process whilethe primary in period.

' witness whereof I have hereunto set my signature.

FERDINANDO FIORELLI.

chamber alone serves uring the refin a regenerating unit having a large and a small heating chamber therein adjacent to each other, each chamber having a mass of checkerwork brick therein, the total volumetric and heat absorption capacity of the checkerwork bein adapted to meet the major requirements 0 the melting furnace during its melting period of operation, and the capaci of the larger chamber and checkerwork adapted to meet the lesser requirements 0 the melting furnace during its refining period of operation, a gas duct leading from the melting furnace to the larger chamber of the regenerator and to. the chimney, a second gas duct leading to the smaller chamber'and to the chimney from a point of junction with the first named duct, and damper means in the secondcduct for controlling'the flow of gas throu h thesmaller chamber of the regenerator-t e volumetric size of said chambers being approximately .2 to 1.

heat regenerator for a regenerative melting furnace, the volumetricdimension of which is adapted to accommodate the volume of the gaseous products of combustion assing from the melting furnace during bot its melting and refining periods, comprising a heat regenerator having a prlmary and secondary chamber therein of suflicient total volumetric capacity, which is approximately 2 to lto meet the major requirements of the meltin furnace during its melting period of operatlon, a division wall separating said 

